How to I get my husband to stop mouth breathing and sucking wind after sentences?

My husband comes from a family of mouth breathers. His mother mouth breathes very loudly, and it is quite disturbing. My husband mouth breathes and I have been after him to try to get him to stop. I can't even stand when is next to me, mouth breathing in my ear and face. Another very strange quirk he has, is sometimes, especially when is excited, is to suck wind after every sentence, through his mouth. Sometimes he makes a hissing sound inward through closed teeth. Otherwise, he purses his lips out and just take a huge intake of air through his mouth, where other people would take a intake of air through the nose. I can't stand it. Please help me otherwise the mouth breather is going to drive me crazy. I don't see any allergies going on here. He lived with his Mamma until he was in his late 40's and he just mimicked and picked up her ugly breathing habits.